The International journal of prosthodontics最新文献_第8页

Neuromuscular Position of the TMJ Condyle in Fully Dentate Volunteers Characteristics and Potential Indications. 全齿状志愿者颞下颌髁神经肌肉位置特征及潜在适应症。

The International journal of prosthodontics Pub Date : 2025-02-24 DOI: 10.11607/ijp.9236

Karl-Heinz Utz, Walter Lückerath, Peter Schwarting, Wolfgang Noethlichs, Ralph Büttner, Manfred Grüner, Edgar Fuß, Helmut Stark, Frauke Müller

{"title":"Neuromuscular Position of the TMJ Condyle in Fully Dentate Volunteers Characteristics and Potential Indications.","authors":"Karl-Heinz Utz, Walter Lückerath, Peter Schwarting, Wolfgang Noethlichs, Ralph Büttner, Manfred Grüner, Edgar Fuß, Helmut Stark, Frauke Müller","doi":"10.11607/ijp.9236","DOIUrl":"https://doi.org/10.11607/ijp.9236","url":null,"abstract":"Purpose: This study comprises the fifth and final part of a comprehensive investigation of the positions of the temporomandibular joint condyles. In this evaluation, we wanted to investigate the neuromuscular position of the mandible.Materials and methods: The neuromuscular condylar positions were recorded by four independent operators in 81 fully dentate subjects with healthy oral function using a central bearing point system and rapid closing movements. The "most frequent adduction point" was determined, and the recordings were repeated twice for each subject. The subjects' maxillary casts were mounted in an articulator using an individual facebow transfer, subsequently the mandibular. casts were mounted with a central-bearing-point registration on the tip of the Gothic arch, i.e. in centric condylar position. A custom-made electronic measuring articulator was used to determine the spatial distance between the condyles in centric relation, maximal occlusion and the newly determined neuromuscular position.Results: The reproducibility of the neuromuscular registrations was on average 0.52±0.16 mm (range 0.04-2.53 mm) with the right and left side averaged. The spatial distances of the condyles between maximal intercuspal position and neuromuscular positions were 0.88±0.30 mm (range 0.12-5.98 mm), again averaged for the right and left sides, whereas the ones between the centric condylar position and the neuromuscular positions were 0.83±0.27 mm (range 0.10-7.89 mm).Conclusions: The neuromuscular mandibular position is neither identical to maximal intercuspal position nor to centric relation. It can therefore be concluded, that the registration of the neuromuscular adduction field should not be recommended for prosthodontic restorations in dentate or edentulous patients.","PeriodicalId":94232,"journal":{"name":"The International journal of prosthodontics","volume":"0 0","pages":"1-31"},"PeriodicalIF":0.0,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143495142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Accuracy of Intraoral Scanning Versus Analog Impression for Multiple Implant-supported Prostheses in Long Edentulous Spans: A Comparative Clinical Study. 口腔内扫描与模拟印模在长无牙段多种植体支持修复中的准确性：一项比较临床研究。

The International journal of prosthodontics Pub Date : 2025-02-06 DOI: 10.11607/ijp.9180

Jie Ma, Binghua Zhang, Hao Song, Shuang Xu, Tiantian Chen, Tao Song

{"title":"Accuracy of Intraoral Scanning Versus Analog Impression for Multiple Implant-supported Prostheses in Long Edentulous Spans: A Comparative Clinical Study.","authors":"Jie Ma, Binghua Zhang, Hao Song, Shuang Xu, Tiantian Chen, Tao Song","doi":"10.11607/ijp.9180","DOIUrl":"https://doi.org/10.11607/ijp.9180","url":null,"abstract":"Purpose: Clinical scientific evidence of the accuracy of intraoral scanning (IOS) impressions for multiple implant-supported prostheses in partially edentulous arches is limited. This in vivo study aimed to evaluate the accuracy of IOS impressions for multiple implants by comparing them with analog impressions.Materials and methods: Patients with three adjacent implants in partially edentulous arches were recruited. For each arch, IOS impressions were obtained. Using the analog splinted impression technique, casts were obtained and scanned with an extraoral scanner. Using metrology software, the distances and angles between the implants were measured in all IOS and analog impression Standard Tessellation Language files. The absolute values of the distance and angular deviation were calculated and analyzed by comparing the two impression methods.Results: Thirty-four patients with partially edentulous arches were enrolled. The distance deviation between the IOS and analog impressions was 85.09 ± 58.73 µm, which was significantly lower than the clinically acceptable error (150 µm; P < .001). The angular deviation was 0.515 ± 0.426°. Distance deviations were significantly correlated with the interimplant distances (r = 0.384, P = .001) and angulations (r = 0.278, P =.022).Conclusions: For multiple implant-supported prostheses in partially edentulous arches, the distance deviation between the IOS and analog impression was within the clinicall acceptable range of misfit and increased with increasing interimplant distance and angulation.","PeriodicalId":94232,"journal":{"name":"The International journal of prosthodontics","volume":"0 0","pages":"1-17"},"PeriodicalIF":0.0,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143367219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Effect of Build Angle on the Mechanical Properties of 3D- Printed Custom Tray Resin Specimens. 构建角度对3D打印定制托盘树脂样品力学性能的影响。

The International journal of prosthodontics Pub Date : 2025-02-06 DOI: 10.11607/ijp.9052

Fatma Uslu Kavrama, Nazli Aydin, Halit Yosuncigir, Yurdanur Ucar

{"title":"The Effect of Build Angle on the Mechanical Properties of 3D- Printed Custom Tray Resin Specimens.","authors":"Fatma Uslu Kavrama, Nazli Aydin, Halit Yosuncigir, Yurdanur Ucar","doi":"10.11607/ijp.9052","DOIUrl":"https://doi.org/10.11607/ijp.9052","url":null,"abstract":"Purpose: The aim of this in vitro study was to evaluate the effect of build angle on the flexural strength (FS), elastic modulus (E), and hardness (VH) of stereolithography (SLA) based 3D-printed custom tray resin.Material and methods: 3D-printed specimens with dimensions of 65.0 mm × 10.0 mm × 3.3 mm ± 0.2 mm were manufactured with different build angles (90, 120, 135, 150, 180 degrees) using custom tray resin. For preparing the specimens in the control groups, the autopolymerizing (AP) resin and the ultraviolet polymerizing (UV) resin were used. FS and E were determined by a three-point bending test, and hardness was evaluated with the VH test. Fracture surfaces were evaluated with scanning electron microscopy (SEM). Statistical analysis of the data was made using a one way ANOVA followed by the Dunnett T3 test.Results: Considering all parameters, the UV group was statistically significantly lower than the other groups. The mean E value of the 90D group was statistically significantly different than those of the 150D group (P=.000) and the 180D group (P=.002). The mean E value of the 120D group was statistically significantly different than those of the 150D group (P=.003) and the 180D group (P=.013). The AP group showed a higher mean VH number (20.20 ±2.08), and the difference was statistically significant compared to the 3D-printed groups (P<.005).Conclusions: Considering its mechanical properties, it was appropriate to arrange the build angles to different degrees when manufacturing reliable custom trays using SLA. 3D printed custom tray production method was a more standard method compared to AP and UV.","PeriodicalId":94232,"journal":{"name":"The International journal of prosthodontics","volume":"0 0","pages":"1-22"},"PeriodicalIF":0.0,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143367225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluation of the Accuracy of Different Intraoral Scanners in Endocrown Restorations. 不同口内扫描仪在牙冠修复中的准确性评价。

The International journal of prosthodontics Pub Date : 2025-02-06 DOI: 10.11607/ijp.9223

Mojdeh Meisami-Azad, Mohammad Alihemmati, Sayed Shojaedin Shayegh, Mohammad Amin Bafandeh

{"title":"Evaluation of the Accuracy of Different Intraoral Scanners in Endocrown Restorations.","authors":"Mojdeh Meisami-Azad, Mohammad Alihemmati, Sayed Shojaedin Shayegh, Mohammad Amin Bafandeh","doi":"10.11607/ijp.9223","DOIUrl":"https://doi.org/10.11607/ijp.9223","url":null,"abstract":"Aims: This in vitro study aimed to assess the trueness and precision of various intraoral scanners (IOSs) in relation to endocrown restorations.Methods: One human mandibular molar was mounted within an acrylic resin block. The tooth was prepared for an endocrown restoration, involving a 2-millimeter cusp reduction, a 3.5-millimeter pulp chamber depth, and a butt joint margin. The sample was scanned by three different IOSs (3Shape TRIOS 4, Carestream 3800, and Medit i700), with 10 scans taken by each, and then converted into STL files. A high-precision scanner captured a reference scan, which was also converted into an STL file. Trueness was assessed by superimposing each sample scan onto the reference, while precision was determined by superimposing the STL files within each group. Statistical analysis was performed using one-way ANOVA with Tukey HSD post hoc test and the Mann Whitney U Test (α = 0.05).Results: The study found that TRIOS 4 exhibited the highest trueness. (22.44 ± 15.01 μm), followed by Medit i700 (24.59 ± 12.80 μm) and CS 3800 (29.05 ± 7.75 μm). In terms of precision, CS 3800 had the best results (21.55 ± 8.87 μm), followed by Medit i700 (43.80 ± 17.42 μm) and TRIOS 4 (47.28 ± 13.93 μm). Only the differences between the precision of the CS 3800 and the other two scanners were statistically significant.Conclusions: The study found that all three scanners had similar trueness, but CS 3800 had significantly better precision than the other two scanners. However, all of the scanners demonstrated acceptable levels of accuracy in the context of endocrown preparation.","PeriodicalId":94232,"journal":{"name":"The International journal of prosthodontics","volume":"0 0","pages":"1-24"},"PeriodicalIF":0.0,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143367222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Number and Angulation of Implants on Accuracy of Digital Impression in Completely Edentulous Arch. 种植体数量和角度对全无牙弓数字印模精度的影响。

The International journal of prosthodontics Pub Date : 2025-02-06 DOI: 10.11607/ijp.9174

Yuyeon Kim, Donghyun Kim, Hyeonseong Son, Seoung-Jin Hong, Hyeong-Seob KIm, Ahran Pae

{"title":"Effect of Number and Angulation of Implants on Accuracy of Digital Impression in Completely Edentulous Arch.","authors":"Yuyeon Kim, Donghyun Kim, Hyeonseong Son, Seoung-Jin Hong, Hyeong-Seob KIm, Ahran Pae","doi":"10.11607/ijp.9174","DOIUrl":"https://doi.org/10.11607/ijp.9174","url":null,"abstract":"Purpose: This study aims to evaluate the accuracy of the impression method using an intraoral scanner and the conventional method based on the implant number and angulation with multiple implants.Materials and methods: Six implants were placed in the maxillary edentulous typodont using 3D modeling software. Eight implants were placed in another maxillary edentulous typodont. The implant placement angulation for each model was different. 3D designing and printing were performed to produce reference models. These models were scanned to obtain reference scan data (RSD). In the conventional impression method, reference models were used, and a gypsum model was produced. Scan data was obtained by the lab scanner (Group CI). Models were scanned and the scan data was obtained (Group IS). The distance and angulation deviation were compared.Results: In models with six implants, except for the distance deviation in Model 6-20, the mean values of all distance and angulation deviations were lesser in Group CI than in Group IS (P < 0.05). In models with eight implants, except for the distance deviation in Model 8-20, the mean values of distance and angulation deviations were lesser in Group CI than in Group IS, and significant differences were observed between the two groups for Models 8-0, 8-10, and 8-20 (P < 0.05).Conclusion: In cases where multiple implants are placed in the completely edentulous arch in vitro, conventional impressions are more accurate than intraoral scans. In the cases of lack of implant parallelism, intraoral scans can be used as a replacement for conventional impressions.","PeriodicalId":94232,"journal":{"name":"The International journal of prosthodontics","volume":"0 0","pages":"1-27"},"PeriodicalIF":0.0,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143367220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

EAO News: How the Junior Committee of the EAO Has Influenced My Professional Development and Made a Lasting Impact on My Career. EAO 新闻：EAO 初级委员会如何影响我的职业发展并对我的职业生涯产生持久影响。

The International journal of prosthodontics Pub Date : 2025-01-31 DOI: 10.11607/ijp.8895

Ignacio Sanz Sánchez

引用次数: 0

Composite Restoration Design Effect During Curing and Chewing. 复合材料修复体设计在固化和咀嚼过程中的效果。

The International journal of prosthodontics Pub Date : 2025-01-31 DOI: 10.11607/ijp.8824

Canan Özcan, Philippe Lestriez, Yannick Josset

{"title":"Composite Restoration Design Effect During Curing and Chewing.","authors":"Canan Özcan, Philippe Lestriez, Yannick Josset","doi":"10.11607/ijp.8824","DOIUrl":"10.11607/ijp.8824","url":null,"abstract":"Purpose: To observe the effect of the cavity design of the direct composite restoration on a real case of the patient's tooth structures after applying mandibular kinematics with finite element analysis.Materials and methods: Four complex maxillomandibular models of the maxillary right second molar and mandibular right second molar were constructed from the patient's CBCT acquisition, and the patient's kinematic data recorded with Modjaw were added. Different shapes and sizes of mesio-occluso-distal (MOD) composite restorations were simulated, including the polymerization shrinkage of this material. Finite element analyses were used to observe the von Mises stresses occurring during polymerization and mastication.Results: The stresses were observed at the cavity margin, and the amplitude of the stresses was higher when the enamel volume was lower. The reduction in occlusal enamel volume with the open-angle vestibular and palatal walls resulted in a greater increase in stresses observed on the structures.Conclusions: The occlusal enamel is the area that bears the maximum masticatory stress, and the loss of this enamel volume generates a much greater concentration of stress on the underlying structures. It is important to preserve as much enamel tissue as possible when designing a cavity for a direct composite restoration.","PeriodicalId":94232,"journal":{"name":"The International journal of prosthodontics","volume":"0 0","pages":"76-83"},"PeriodicalIF":0.0,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140103138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Stresses in Premolars Restored Using Different Post-and-Core and Crown Materials: A Finite Element Analysis Study. 使用不同的桩核和牙冠材料修复前臼齿时的应力：有限元分析研究

The International journal of prosthodontics Pub Date : 2025-01-31 DOI: 10.11607/ijp.8839

Tatjana Maravić, Claudia Mazzitelli, Allegra Comba, Uros Josic, Federico Del Bianc, Annamaria Forte, Darko Vasiljević, Larisa Blažić, Lorenzo Breschi, Annalisa Mazzoni

{"title":"Stresses in Premolars Restored Using Different Post-and-Core and Crown Materials: A Finite Element Analysis Study.","authors":"Tatjana Maravić, Claudia Mazzitelli, Allegra Comba, Uros Josic, Federico Del Bianc, Annamaria Forte, Darko Vasiljević, Larisa Blažić, Lorenzo Breschi, Annalisa Mazzoni","doi":"10.11607/ijp.8839","DOIUrl":"10.11607/ijp.8839","url":null,"abstract":"Purpose: To investigate the influence of three post-and-core systems and two crown materials on stresses in restored premolars using finite element analysis (FEA).Materials and methods: A maxillary second premolar 3D model was created in SolidWorks 2014 (Dassault Systémés). Severe loss of tooth structure was simulated with six restorative options: (1) glass-fiber-reinforced composite post and composite core (GFRC) + CAD/CAM leucite-reinforced glass-ceramic crown (LRC); (2) carbon-fiberreinforced composite post and composite core (CFRC) + LRC; (3) metal cast post-and-core (MPC) + LRC; (4) GFRC + CAD/CAM composite resin crown (CC); (5) CFRC + CC; and (6) MPC + CC. Three-point occlusal loading (150 N) was simulated and von Mises and maximum principal stresses were calculated.Results: Although maximum von Mises stresses in the crown and dentin were similar across groups (137.9 to 139.2 MPa crown; 17.2 to 19.6 dentin), there were important differences in stress distribution in dentin. Maximum stresses were on the bottom of the post preparation cavity only in the MPC + CC group. Stress values for the posts were CFRC (4.8 MPa) > GFRC (6.7 MPa) > MPC (10.3 MPa). CC-restored models presented higher von Mises stresses for the post-and-core compared to the LRC groups. Maximum principal stresses were lower compared to von Mises stresses, following the same trend, and were distributed similarly in all groups.Conclusions: Both GFRC and CFRC showed favorable stress distribution in the dentin and restorative materials, while MPC increased stresses in the core, post, and post cement. The more rigid crown material seems to transmit less stress to the underlying core and crown cement compared to CC.","PeriodicalId":94232,"journal":{"name":"The International journal of prosthodontics","volume":"0 0","pages":"93-103"},"PeriodicalIF":0.0,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140295685","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

3D-Printed Zirconia and Lithium Disilicate in Dentistry and Their Clinical Applications. 牙科中的 3D 打印氧化锆和二硅酸锂及其临床应用。

The International journal of prosthodontics Pub Date : 2025-01-31 DOI: 10.11607/ijp.8831

Wei-Shao Lin, Li Chen, Amal Alfaraj

引用次数: 0

Update on the Accuracy of Digital Implant Impressions: A Coordinate-Based Analysis. 2023 年数字化种植体印模准确性的最新进展：基于坐标的分析

The International journal of prosthodontics Pub Date : 2025-01-31 DOI: 10.11607/ijp.8843

Alexander Schmidt, Cara Berschin, Bernd Wöstmann, Maximiliane Amelie Schlenz

{"title":"Update on the Accuracy of Digital Implant Impressions: A Coordinate-Based Analysis.","authors":"Alexander Schmidt, Cara Berschin, Bernd Wöstmann, Maximiliane Amelie Schlenz","doi":"10.11607/ijp.8843","DOIUrl":"10.11607/ijp.8843","url":null,"abstract":"Purpose: To update data on the transfer accuracy of digital implant impressions using a coordinate-based analysis, the latest intraoral scanners (IOS) were investigated in an established clinical close model setup.Materials and methods: An implant master model (IMM) of the maxilla with four implants in the posterior area (maxillary first premolars and first molars) and a reference cube were scanned 10 times each with four different IOS: i700 (i7; Medit), Primescan (PS; Dentsply Sirona), and Trios 4 (T4) and Trios 5 (T5; 3Shape). Datasets were compared to a reference dataset of IMM that was generated with x-ray computed tomography in advance. 3D deviations for the implant-abutment interface points (IAIPs) were calculated. Statistical analysis was performed by multifactorial ANOVA (P < .05).Results: Overall deviations for trueness (mean) ± precision (SD) of the IAIPs ranged from 88 ± 47 μm for PS, 112 ± 57 μm for i7, 121 ± 42 μm for T4, and 124 ± 43 μm for T5 with decreasing accuracy along the scan path. For trueness, a significant difference between the PS and the T4 was detected for one implant position. For precision, no significant differences were noticed.Conclusions: Although the latest IOS showed a significant improvement in transfer accuracy, the accumulating deviation along the scan path is not yet resolved. Considering the Trios system, the innovation seems to be limited because no improvement could be detected between T4 and T5.","PeriodicalId":94232,"journal":{"name":"The International journal of prosthodontics","volume":"0 0","pages":"104-110"},"PeriodicalIF":0.0,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140295686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0